lily/paper-def.cc

   1 /*
   2   paper-def.cc -- implement Paper_def
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9
  10 #include <math.h>
  11
  12 #include "virtual-font-metric.hh"
  13 #include "all-font-metrics.hh"
  14 #include "string.hh"
  15 #include "misc.hh"
  16 #include "paper-def.hh"
  17 #include "warn.hh"
  18 #include "scaled-font-metric.hh"
  19 #include "main.hh"
  20 #include "scm-hash.hh"
  21 #include "input-file-results.hh" // urg? header_global
  22 #include "paper-outputter.hh"
  23
  24 /*
  25   This is an almost empty thing. The only substantial thing this class
  26   handles, is scaling up and down to real-world dimensions (internally
  27   dimensions are against global staff-space.)
  28
  29  */
  30 Paper_def::Paper_def ()
  31 {
  32 }
  33
  34 Paper_def::~Paper_def ()
  35 {
  36 }
  37
  38 Paper_def::Paper_def (Paper_def const&src)
  39   : Music_output_def (src)
  40 {
  41 }
  42
  43
  44 Real
  45 Paper_def::get_var (String s) const
  46 {
  47   return get_realvar (ly_symbol2scm (s.to_str0 ()));
  48 }
  49
  50 SCM
  51 Paper_def::get_scmvar (String s) const
  52 {
  53   return variable_tab_->get (ly_symbol2scm (s.to_str0 ()));
  54 }
  55
  56
  57 SCM
  58 Paper_def::get_scmvar_scm (SCM sym) const
  59 {
  60   return  gh_double2scm (get_realvar (sym));
  61 }
  62
  63 Real
  64 Paper_def::get_realvar (SCM s) const
  65 {
  66   SCM val ;
  67   if (!variable_tab_->try_retrieve (s, &val))
  68     {
  69       programming_error ("unknown paper variable: " +  ly_symbol2string (s));
  70       return 0.0;
  71     }
  72
  73   Real sc = 1.0;
  74   SCM ssc;
  75   if (variable_tab_->try_retrieve (ly_symbol2scm ("outputscale"), &ssc))
  76     {
  77       sc = gh_scm2double (ssc);
  78     }
  79   if (gh_number_p (val))
  80     {
  81       return gh_scm2double (val) / sc;
  82     }
  83   else
  84     {
  85       programming_error ("not a real variable");
  86       return 0.0;
  87     }
  88 }
  89
  90 /*
  91   FIXME. This is broken until we have a generic way of
  92   putting lists inside the \paper block.
  93  */
  94 Interval
  95 Paper_def::line_dimensions_int (int n) const
  96 {
  97   Real lw =  get_var ("linewidth");
  98   Real ind = n? 0.0:get_var ("indent");
  99
 100   return Interval (ind, lw);
 101 }
 102
 103
 104
 105 int Paper_def::score_count_ = 0;
 106
 107 int
 108 Paper_def::get_next_score_count () const
 109 {
 110   return score_count_ ++;
 111 }
 112
 113 void
 114 Paper_def::reset_score_count ()
 115 {
 116   score_count_ = 0;
 117 }
 118
 119
 120 Paper_outputter*
 121 Paper_def::get_paper_outputter ()
 122 {
 123   String outname = outname_string ();
 124   progress_indication (_f ("paper output to `%s'...",
 125                            outname == "-" ? String ("<stdout>") : outname));
 126
 127   global_input_file->target_strings_.push (outname);
 128   Paper_outputter * po = new Paper_outputter (outname);
 129   Path p = split_path (outname);
 130   p.ext = "";
 131   po->basename_ = p.string ();
 132   return po;
 133 }
 134
 135
 136 /*
 137   todo: use symbols and hashtable idx?
 138
 139
 140 */
 141 Font_metric *
 142 Paper_def::find_font (SCM fn, Real m)
 143 {
 144   SCM key = gh_cons (fn, gh_double2scm (m));
 145   SCM met = scm_assoc (key, scaled_fonts_);
 146
 147   if (gh_pair_p (met))
 148     return unsmob_metrics (ly_cdr (met));
 149
 150   /*
 151     Hmm. We're chaining font - metrics. Should consider wether to merge
 152     virtual-font and scaled_font.
 153    */
 154   Font_metric*  f=0;
 155   if (gh_list_p (fn))
 156     {
 157       f = new Virtual_font_metric (fn, m, this);
 158     }
 159   else
 160     {
 161       SCM ssc;
 162       if (variable_tab_->try_retrieve (ly_symbol2scm ("outputscale"), &ssc))
 163         {
 164           m /= gh_scm2double (ssc);
 165         }
 166
 167       f = all_fonts_global->find_font (ly_scm2string (fn));
 168       SCM val = Scaled_font_metric::make_scaled_font_metric (f, m);
 169       scaled_fonts_ = scm_acons (key, val, scaled_fonts_);
 170       f = unsmob_metrics (val);
 171       scm_gc_unprotect_object (val);
 172     }
 173
 174   return f;
 175 }
 176
 177
 178 /*
 179   Return alist to translate internally used fonts back to real-world
 180   coordinates.  */
 181 SCM
 182 Paper_def::font_descriptions ()const
 183 {
 184   SCM l = SCM_EOL;
 185   for (SCM s = scaled_fonts_; gh_pair_p (s); s = ly_cdr (s))
 186     {
 187       SCM desc = ly_caar (s);
 188       SCM mdesc = unsmob_metrics (ly_cdar (s))->description_;
 189
 190       l = gh_cons (gh_cons (mdesc, desc), l);
 191     }
 192   return l;
 193 }